Thermostatic flasher lamp



March 18-, 1941. B; m 2,235,360

THERMOSTATIC FLASHER LAMP Filed May 4, 1940 lEn Patented Mar. 18, 1941 UNITED sTATas THERMOSTATIC FLASHER LAMP George B. Davis, In, Washington, D. 0. Application Mayd, 1940, Serial No. 333,434

11 Claims.

remaining lights in the series, as is the case with other lights of this type.

Another object of the invention is to provide a flasher light of rugged construction, inexpensive to manufacture, yet practical and efilcient to a high degree.

In order that this invention may be more fully understood attention is called to the accompanying drawing.

Fig. 1 is a sectional view of a lamp embodying the invention.

Fig. 2, a sectional view of a multiple filament lamp embodying thermostatic means for shorting out one filament.

Fig. 3, a sectional view of a multiple filament lamp embodying thermostatic means for bringing into circuit the second filament. I

Fig 4 shows a plan view of the pinch and leads in relation to the thermostatic strip as indicated by section line 28 in Fig. 1.

Fig. is a plan view of the pinch and leads in relation to the thermostatic strip as shown by section lines 29 and 30 in Figs. 2 and 3.

In Fig. 1, i is the globe, 2 is the shell-cap, leads 3 and d support the filament l and connect with the contacts on the shell at 3 and 9. No. 5 is a thermostrip spot-welded to one of the leads and in position for moving into contact with other of said leads when actuated by the heat from the filament. When in operation the thermostrip, on getting hot bends forward and contacts the other lead-wire, shunting the current beneath the filament and causing it to cool, and in turn the thermostrip cools and bends away from the second lead, permitting the current to resume its of this lamp one of the filaments is shorted out at intervals thus diminishing the light by one half which gives a twinkling effect to the lamp.

Fig. 3 is a multiple filament lamp. Leads I 9 and 20 connect with the shell-cap at 26 and 21; 2! is a dummy lead supporting one end of filament 25; 22 is a thermostrip spot-welded onto lead IQ for being actuated by filament 24, and for moving into contact with dummy lead 28, thus shunting the current through filament 25 causing it to light. When 25 lights, the current through is diminished by one-half and thermostrip 22, being set for operating at its hottest stage, cools enoughto move away from dummy lead 2!, breaking the circuit through filament 25 permitting 26 to resume its original brightness.

These globes are to be used in series only and will not work in a multiple hook-up.

' Fig. 4 shows the leads 3 and t and thermostrip 5 and its relation to them.

Fig. 5 shows the leads as arranged in Fig. 2 and Fig. 3, showing the thermostrip in open position to the lead it is to contact when in operation.

I claim: v

1. An incandescent flasher lamp comprising a filament, leads to said filament, thermostatic shunt means connecting one of said leads, and in position to move into and out of contact with the other 01 said leads.

2. A multiple filament incandescent flasher lamp, leads to said filaments, one of said leads being a dummy lead, one end of each filament 'being connected to said dummy lead, the other end of each of said filaments being connected to individual leads, a bimetallic shunt strip connecting one of said individual leads and in position for moving into and out of contact with the said dummy lead.

3. A- multiple filament incandescent lamp, leads to said filaments, one of said leads being a dummy lead, one end of each filament being connected to said dummy lead, the other end of each of said filaments being connected to individual leads, a thermostrip connecting said dummy lead and in position for moving into and'out of con tact with one of said individual leads.

[4. A multiple filament incandescent flasher lamp, a common lead connecting one end of each filament, individual leads connecting the other end of each of said filaments, one of said individual leads being a dum strip connecting one oi said individual leads and lily/lead, a bimetallic I in position for moving into and out or contact the other. a

5. An incandescent flasher lamp comprising a. filament, leads to said filament, a thermostripconnecting one of said leads and in position for movingintoand out of contact with a portion of the other-oisaid leads. "iinanincandescentflasher lamp comprising a connected to one of said leads and in open position to the other said lead and movable into contact with the other said lead.

7. An incandescent flasher lamp comprising a. filament, leads to said filament, thermostatic means embodied in said lamp for shorting out a portion of said filament.

8. An incandescent flasher lamp comprising a filament, leads to said filament, a bimetallic strip connecting one of said leads and in position for shorting out a portion of said filament.

9. An incandescent flasher lamp comprising a a filament, leads to said filament, a bimetallic strip 

